A short public ferry from the centre gets you to a green island with monastery ruins and swimming spots. In summer this is one of the best-value things you can do in Oslo. Out of season it's just a cold, empty island.
🕒 How long
Half a day
👤 Suits
Summer visitors wanting the fjord without a big trip
🗓️ Season
Strongly summer. Check ferry timetables — service is much thinner outside the warm months.
This is personal opinion, not a sponsored listing.
Practical
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🕐
Not listed — check the official website before you go.